FLOW-ACOUSTIC INTERACTION IN CORRUGATED PIPES: TIME-DOMAIN SIMULATION OF EXPERIMENTAL PHENOMENA

A phenomenological model based on the coupling between a set of “pressure vortex oscillators ” and an acoustic field is considered to simulate the dynamical behaviour of a corrugated pipe. The effect of a random Gaussian dispersion of the Strouhal number is investigated by means of non-linear numerical time-domain simulations and also in terms of the modeshapes of the linearized aeroacoustical model. The results demonstrate that such perturbations may qualitatively change the dynamics of the model and might cause local-ization phenomenon. 1